// intern.hpp
// A table for string interning.
//
// Copyright (C) 2008  Maksim Sipos <msipos@mailc.net>
//
// This file is a part of the Ripe language project.
//
// Ripe is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef R_INTERN_HPP
#define R_INTERN_HPP

#include "adts/map.hpp"

namespace Ripe {
  // An interned version of a string is requested, but doesn't exist.
  class ErrorIntern : public Exception {};

  class Intern {
    public:
      Intern();

      // Does the given string exist in the table?
      bool exists(char* s);

      // Get the interned version of the given string. If the string is
      // already interned, the interned version is returned. Otherwise, a
      // string copy is kept for internment.
      char* intern(char* s);
    private:
      Map<char*, char*> map;
  };
}

#endif // R_INTERN_HPP
